[dev.link] cmd/link: simplify asmb2

Move lots of the binary-file format specific pieces into their
appropriate places. Similarly rescope some variables to just ld.

Change-Id: I74bc6d8aba58f5ac86e6579be1fcb356c4636825
Reviewed-on: https://go-review.googlesource.com/c/go/+/235278
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
6 files changed
tree: 552ee542527cea3dc85f6c57ceb568ee2606e806
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
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